****** phone not blocked

Friday night my wife's phone was ******, Saturday we went in the branch to report it and get the phone blocked went to the police station for case number to claim from insurance. Sunday we went back and they sent in the claim form and told us the phone has been blocked and blacklisted. This morning, Monday, I log on to Whatsapp and i see on my wife's profile last seen was a few mins ago and her profile pic has been changed, I sent a message and the p[person who stole the phone begins chatting to me. My wife phoned Vodacom and they said the phone is showing on their system its blocked but this guy is still using the phone. I need this phone to be blocked and blacklisted or whatever you need to do before he causes big damage. He has access to her Facebook, bank apps, her payslips are on the phone. We need this done please!!!